tests/src/unit-diagnostics.cpp

//     __ _____ _____ _____
//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
// |  |  |__   |  |  | | | |  version 3.11.3
// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
//
// Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.
// SPDX-FileCopyrightText: 2013-2023 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT

#include "doctest_compatibility.h"

#ifdef JSON_DIAGNOSTICS
    #undef JSON_DIAGNOSTICS
#endif

#define JSON_DIAGNOSTICS 1

#include <nlohmann/json.hpp>
using nlohmann::json;

TEST_CASE("Better diagnostics")
{
    SECTION("empty JSON Pointer")
    {
        json const j = 1;
        std::string s;
        CHECK_THROWS_WITH_AS(s = j.get<std::string>(), "[json.exception.type_error.302] type must be string, but is number", json::type_error);
    }

    SECTION("invalid type")
    {
        json j;
        j["a"]["b"]["c"] = 1;
        std::string s;
        CHECK_THROWS_WITH_AS(s = j["a"]["b"]["c"].get<std::string>(),
                             "[json.exception.type_error.302] (/a/b/c) type must be string, but is number",
                             json::type_error);
    }

    SECTION("missing key")
    {
        json j;
        j["object"]["object"] = true;
        CHECK_THROWS_WITH_AS(j["object"].at("not_found"), "[json.exception.out_of_range.403] (/object) key 'not_found' not found", json::out_of_range);
    }

    SECTION("array index out of range")
    {
        json j;
        j["array"][4] = true;
        CHECK_THROWS_WITH_AS(j["array"].at(5), "[json.exception.out_of_range.401] (/array) array index 5 is out of range", json::out_of_range);
    }

    SECTION("array index at wrong type")
    {
        json j;
        j["array"][4] = true;
        CHECK_THROWS_WITH_AS(j["array"][4][5],
                             "[json.exception.type_error.305] (/array/4) cannot use operator[] with a numeric argument with boolean",
                             json::type_error);
    }

    SECTION("wrong iterator")
    {
        json j;
        j["array"] = json::array();
        CHECK_THROWS_WITH_AS(j["array"].erase(j.begin()),
                             "[json.exception.invalid_iterator.202] (/array) iterator does not fit current value",
                             json::invalid_iterator);
    }

    SECTION("JSON Pointer escaping")
    {
        json j;
        j["a/b"]["m~n"] = 1;
        std::string s;
        CHECK_THROWS_WITH_AS(s = j["a/b"]["m~n"].get<std::string>(),
                             "[json.exception.type_error.302] (/a~1b/m~0n) type must be string, but is number",
                             json::type_error);
    }

    SECTION("Parse error")
    {
        json _;
        CHECK_THROWS_WITH_AS(
            _ = json::parse(""),
            "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON",
            json::parse_error);
    }

    SECTION("Wrong type in update()")
    {
        json j = { { "foo", "bar" } };
        json k = { { "bla", 1 } };

        CHECK_THROWS_WITH_AS(j.update(k["bla"].begin(), k["bla"].end()),
                             "[json.exception.type_error.312] (/bla) cannot use update() with number",
                             json::type_error);
        CHECK_THROWS_WITH_AS(j.update(k["bla"]), "[json.exception.type_error.312] (/bla) cannot use update() with number", json::type_error);
    }
}

TEST_CASE("Regression tests for extended diagnostics")
{
    SECTION("Regression test for https://github.com/nlohmann/json/pull/2562#pullrequestreview-574858448")
    {
        CHECK_THROWS_WITH_AS(json({ "0", "0" })[1].get<int>(), "[json.exception.type_error.302] (/1) type must be number, but is string", json::type_error);
        CHECK_THROWS_WITH_AS(json({ "0", "1" })[1].get<int>(), "[json.exception.type_error.302] (/1) type must be number, but is string", json::type_error);
    }

    SECTION("Regression test for https://github.com/nlohmann/json/pull/2562/files/380a613f2b5d32425021129cd1f371ddcfd54ddf#r563259793")
    {
        json j;
        j["/foo"] = { 1, 2, 3 };
        CHECK_THROWS_WITH_AS(j.unflatten(), "[json.exception.type_error.315] (/~1foo) values in object must be primitive", json::type_error);
    }

    SECTION("Regression test for issue #2838 - Assertion failure when inserting into arrays with JSON_DIAGNOSTICS set")
    {
        // void push_back(basic_json&& val)
        {
            json j_arr = json::array();
            j_arr.push_back(json::object());
            j_arr.push_back(json::object());
            j_arr.push_back(json::object());
            j_arr.push_back(json::object());
            json j_obj = json::object();
            j_obj["key"] = j_arr;
        }

        // void push_back(const basic_json& val)
        {
            json j_arr = json::array();
            auto object = json::object();
            j_arr.push_back(object);
            j_arr.push_back(object);
            j_arr.push_back(object);
            j_arr.push_back(object);
            json j_obj = json::object();
            j_obj["key"] = j_arr;
        }

        // reference emplace_back(Args&& ... args)
        {
            json j_arr = json::array();
            j_arr.emplace_back(json::object());
            j_arr.emplace_back(json::object());
            j_arr.emplace_back(json::object());
            j_arr.emplace_back(json::object());
            json j_obj = json::object();
            j_obj["key"] = j_arr;
        }

        // iterator insert(const_iterator pos, const basic_json& val)
        {
            json j_arr = json::array();
            j_arr.insert(j_arr.begin(), json::object());
            j_arr.insert(j_arr.begin(), json::object());
            j_arr.insert(j_arr.begin(), json::object());
            j_arr.insert(j_arr.begin(), json::object());
            json j_obj = json::object();
            j_obj["key"] = j_arr;
        }

        // iterator insert(const_iterator pos, size_type cnt, const basic_json& val)
        {
            json j_arr = json::array();
            j_arr.insert(j_arr.begin(), 2, json::object());
            json j_obj = json::object();
            j_obj["key"] = j_arr;
        }

        // iterator insert(const_iterator pos, const_iterator first, const_iterator last)
        {
            json j_arr = json::array();
            json j_objects = { json::object(), json::object() };
            j_arr.insert(j_arr.begin(), j_objects.begin(), j_objects.end());
            json j_obj = json::object();
            j_obj["key"] = j_arr;
        }
    }

    SECTION("Regression test for issue #2962 - JSON_DIAGNOSTICS assertion for ordered_json")
    {
        nlohmann::ordered_json j;
        nlohmann::ordered_json j2;
        const std::string value;
        j["first"] = value;
        j["second"] = value;
        j2["something"] = j;
    }

    SECTION("Regression test for issue #3007 - Parent pointers properly set when using update()")
    {
        // void update(const_reference j)
        {
            json j = json::object();

            {
                json j2 = json::object();
                j2["one"] = 1;

                j.update(j2);
            }

            // Must call operator[] on const element, otherwise m_parent gets updated.
            auto const& constJ = j;
            CHECK_THROWS_WITH_AS(constJ["one"].at(0), "[json.exception.type_error.304] (/one) cannot use at() with number", json::type_error);
        }

        // void update(const_iterator first, const_iterator last)
        {
            json j = json::object();

            {
                json j2 = json::object();
                j2["one"] = 1;

                j.update(j2.begin(), j2.end());
            }

            // Must call operator[] on const element, otherwise m_parent gets updated.
            auto const& constJ = j;
            CHECK_THROWS_WITH_AS(constJ["one"].at(0), "[json.exception.type_error.304] (/one) cannot use at() with number", json::type_error);
        }

        // Code from #3007 triggering unwanted assertion without fix to update().
        {
            json root = json::array();
            json lower = json::object();

            {
                json lowest = json::object();
                lowest["one"] = 1;

                lower.update(lowest);
            }

            root.push_back(lower);
        }
    }

    SECTION("Regression test for issue #3032 - Yet another assertion failure when inserting into arrays with JSON_DIAGNOSTICS set")
    {
        // reference operator[](size_type idx)
        {
            json j_arr = json::array();
            j_arr[0] = 0;
            j_arr[1] = 1;
            j_arr[2] = 2;
            j_arr[3] = 3;
            j_arr[4] = 4;
            j_arr[5] = 5;
            j_arr[6] = 6;
            j_arr[7] = 7;
            json const j_arr_copy = j_arr;
        }
    }
}